航空航天制造业代表着一个国家的制造业的发展水平和综合国力。而钛合金用量占飞机重量的百分比又是衡量飞机先进程度的重要标志之一。目前我国钛合金加工的效率和质量仍处于较低水平，这已成为限制我国航空航天制造业进步的瓶颈之一。提升钛合金国产刀具的加工效率和使用寿命，实现钛合金高性能加工刀具的国产化迫在眉睫。本文旨在提高钛合金国产刀具的加工效率和使用寿命，而着手点是通过电磁强化处理技术这种能量场方法提升钛合金国产刀具的切削性能。本文采用一种脉冲磁场强化处理技术，曾在钢铁类零件涂层硬质合金机加刀具延寿方面取得显著效果和较广泛应用，并在钛合金铣削刀具电磁强化延寿方面也进行了尝试，在部分场合也取得了良好效果。本文的研究目标在于揭示电磁强化对硬质合金刀具切削钛合金性能的影响规律和机理，确定充分发挥磁化延寿作用的合理工艺条件。首先通过实验测试研究电磁强化对硬质合金与切削性能相关的材料性能的影响规律，以Co含量分别为6.1%、10.3%、13.5%的三种硬质合金作为实验材料，以电磁强化处理后材料的硬度和韧性为标准，确定了三种硬质合金材料的最优电磁强化参数。并对最优电磁强化参数处理后的硬质合金材料进行了热物理特性以及摩擦系数的实验，发现电磁强化能提高硬质合金材料的热传导系数以及高速下的摩擦系数，而且Co含量越高，磁化效果越明显。在刀具材料特性研究基础上，本文通过钛合金正交切削实验，研究不同切削条件下刀具的磁化对切削力和切削温度的影响规律，建立了切削力、切削温度的经验模型。研究表明，在高速、大进给工艺条件下，具有较高Co含量的硬质合金刀具的磁化具有降低切削力和切削温度的工艺效果。进一步的刀具正交切削磨损实验也表明，在高速、大进给的工艺条件下，某种磁化硬质合金刀具寿命提升133.3%。通过仿真分析及切削理论对实验结果进行了分析，阐明了电磁强化硬质合金刀具改善钛合金切削性能的机理。铣削加工是钛合金重要的加工方式，本文还开展了钛合金铣削实验，研究不同切削条件下刀具的磁化对切削力、切削温度和刀具磨损的影响规律，同样发现高速、大进给是铣削加工中发挥磁强化作用的工艺条件，某种磁化硬质合金铣刀刀具寿命提升17.2%。
The aerospace manufacturing industry represents the development level and overall national strength of a country's manufacturing industry. The percentage of titanium alloy in the weight of the aircraft is one of the important indicators to measure the advanced level of the aircraft. At present, the efficiency and quality of titanium alloy processing in China are still at a low level, which has become one of the bottlenecks restricting the progress of China's aerospace manufacturing industry. It is imminent to improve the processing efficiency and service life of titanium alloy domestic cutting tools and realize the localization of titanium alloy high-performance cutting tools.This article aims to improve the machining efficiency and service life of titanium alloy domestic tools, and the starting point is to improve the cutting performance of titanium alloy domestic tools through the energy field method of electromagnetic strengthening treatment technology. This paper adopts a pulsed magnetic field strengthening treatment technology, which has achieved significant results and wider application in the life extension of coated hard alloy machined tools of steel parts and tools. It has also tried in the electromagnetic strengthening life extension of titanium alloy milling tools. Good results have also been achieved on occasions. The research goal of this paper is to reveal the influence law and mechanism of electromagnetic strengthening on the cutting performance of cemented carbide tool cutting titanium alloy, and to determine the reasonable technological conditions to fully play the role of magnetization and life extension.First, the experimental study was conducted to study the effect of electromagnetic strengthening on the properties of cemented carbide and cutting performance-related materials. Three kinds of cemented carbide with Co content of 6.1%, 10.3%, and 13.5% were used as experimental materials. After electromagnetic strengthening treatment The hardness and toughness of the material are the standards, and the optimal electromagnetic strengthening parameters of the three cemented carbide materials are determined. Experiments on the thermo-physical properties and friction coefficients of the cemented carbide materials processed with the optimal electromagnetic strengthening parameters were conducted, and it was found that electromagnetic strengthening can improve the thermal conductivity coefficient and friction coefficient of the cemented carbide material at high speed, and the higher the Co content The more obvious the magnetization effect.Based on the research of tool material characteristics, this paper studies the influence of the tool magnetization on cutting force and cutting temperature under different cutting conditions through the orthogonal cutting experiment of titanium alloy, and establishes an empirical model of cutting force and cutting temperature. Studies have shown that under the conditions of high speed and large feed technology, the magnetization of cemented carbide tools with higher Co content has the technological effect of reducing cutting force and cutting temperature. Further tool orthogonal cutting wear experiments also show that under the high-speed, high-feed process conditions, the life of a certain magnetized carbide tool is increased by 133.3%. The experimental results are analyzed through simulation analysis and cutting theory, and the mechanism of electromagnetically strengthened carbide cutting tools to improve the cutting performance of titanium alloys is clarified.Milling is an important processing method for titanium alloys. This article also carried out titanium alloy milling experiments to study the effect of tool magnetization on cutting force, cutting temperature and tool wear under different cutting conditions. It also found that high speed and large feed are milling. In the process conditions where the magnetic strengthening effect is exerted, the life of a certain magnetized carbide milling cutter tool is increased by 17.2%.
